/*!	 valuenode_stripes.cpp
**	 Implementation of the "Stripes" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include "valuenode_stripes.h"
#include "valuenode_const.h"
#include <stdexcept>
#include <synfig/color.h>
#include <synfig/gradient.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_Stripes, RELEASE_VERSION_0_61_06, "stripes", "Stripes")

synfig::ValueNode_Stripes::ValueNode_Stripes(): LinkableValueNode(synfig::type_gradient)
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);
    set_link("color1", ValueNode_Const::create(Color::alpha()));
    set_link("color2", ValueNode_Const::create(Color::black()));
    set_link("stripes", stripes_ = ValueNode_Const::create(int(5)));
    set_link("width", ValueNode_Const::create(0.5));
}

LinkableValueNode*
ValueNode_Stripes::create_new()const
{
    return new ValueNode_Stripes();
}

ValueNode_Stripes*
ValueNode_Stripes::create(const ValueBase& x)
{
    Type &type(x.get_type());

    if (type != type_gradient) {
        assert(0);
        throw runtime_error(String(_("Stripes")) + _(":Bad type ") + type.description.local_name);
    }

    ValueNode_Stripes* value_node = new ValueNode_Stripes();

    assert(value_node->get_type() == type);

    return value_node;
}

synfig::ValueNode_Stripes::~ValueNode_Stripes()
{
    unlink_all();
}

synfig::ValueBase
synfig::ValueNode_Stripes::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    const int total((*stripes_)(t).get(int()));
    int i;
    Gradient ret;

    if (total <= 0) {
        return ret;
    }

    const Color color1((*color1_)(t).get(Color()));
    const Color color2((*color2_)(t).get(Color()));
    const float width(max(0.0, min(1.0, (*width_)(t).get(Real()))));

    const float stripe_width_a(width / total);
    const float stripe_width_b((1.0 - width) / total);

    for (i = 0; i < total; i++) {
        float pos(float(i) / total + stripe_width_b / 2);
        ret.push_back(Gradient::CPoint(pos, color1));
        ret.push_back(Gradient::CPoint(pos, color2));
        pos += stripe_width_a;
        ret.push_back(Gradient::CPoint(pos, color2));
        ret.push_back(Gradient::CPoint(pos, color1));
    }

    return ret;
}

bool
ValueNode_Stripes::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(color1_,  type_color);

    case 1:
        CHECK_TYPE_AND_SET_VALUE(color2_,  type_color);

    case 2:
        CHECK_TYPE_AND_SET_VALUE(stripes_, type_integer);

    case 3:
        CHECK_TYPE_AND_SET_VALUE(width_,   type_real);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_Stripes::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        return color1_;

    case 1:
        return color2_;

    case 2:
        return stripes_;

    case 3:
        return width_;
    }

    return 0;
}

bool
ValueNode_Stripes::check_type(Type &type)
{
    return type == type_gradient;
}

LinkableValueNode::Vocab
ValueNode_Stripes::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "color1")
                  .set_local_name(_("Color 1"))
                  .set_description(_("One color of the gradient stripes"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "color2")
                  .set_local_name(_("Color 2"))
                  .set_description(_("Other color of the gradient stripes"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "stripes")
                  .set_local_name(_("Stripe Count"))
                  .set_description(_("Number of stripes in the gradient"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "width")
                  .set_local_name(_("Width"))
                  .set_description(_("Width of stripes in the gradient between [0,1]"))
                 );

    return ret;
}